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US3572976A - Fluid takeoff device for canned motor driven pump - Google Patents

Fluid takeoff device for canned motor driven pump Download PDF

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Publication number
US3572976A
US3572976A US764242A US3572976DA US3572976A US 3572976 A US3572976 A US 3572976A US 764242 A US764242 A US 764242A US 3572976D A US3572976D A US 3572976DA US 3572976 A US3572976 A US 3572976A
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United States
Prior art keywords
fluid
circular groove
impeller chamber
motor driven
driven pump
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Expired - Lifetime
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US764242A
Inventor
Ryuichi Sato
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Nikkiso Co Ltd
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Nikkiso Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/0613—Special connection between the rotor compartments

Definitions

  • This invention relates to a fluid takeoff device for canned motor driven pump.
  • the canned motor driven pump has such characteristic features that an interior of the stator and an external surface of the rotor of the driving motor are welded and sealed with an anticorrosive sheet metal of nonmagnetic responsive property, and a part of the fluid is taken off from an outlet and then led through a circulation tubing into the rear side of the rotor chamber to permit a.
  • the circulation fluid for cooling and lubricating the motor and the bearing is taken ofi from the pump delivery connection through an auxiliary fluid takeoff pipe connected to the filter or screen provided along the tubular outlet.
  • a flow velocity at the nozzle portion is relatively changed with variation of the static pressure in proportion to the discharge rate of the pump so that flow rate of the circulation fluid is abruptly reduced in accordance with a rise of the discharge rate of the pump as is shown by a dotted line in HG. 4.
  • Another object of the invention is to provide a new fluid takeoff device for canned motor driven pump in which a part of the circulation fluid for cooling and lubricating motor rotors and bearings is led through the back wall of the pump impeller chamber so that a flow rate of the circulation fluid is stabilized without being influenced by variation in the discharge rate of the pump.
  • Still another object of the invention is to provide a fluid takeoff device which comprises an impeller chamber surface of partition wall partitioning the impeller chamber and the motor chamber, a circular groove provided at a predetermined distance from the center of said impeller chamber surface with a given width and depth, a screen member covering said circular groove in such way that the surface of said screen member comes in flat with the plane of the impeller chamber surface, a fluid chamber formed of a spacing between the wall of circular groove and the screen member, an inner slot provided in the partition wall to communicate with the fluid chmber and a circulation tubing connected to said inner slot outside the partition wall.
  • FIG. 1 is a longitudinally sectioned lateral view, in partially broken away, of a canned motor driven pump with a fluid takeoff device applied in accordance with the invention
  • FIG. 2 is a fragmentarily enlarged sectional view of the fluid takeoff device of !FIG. 1;
  • FIG. 3 is a fragmentarily enlarged sectional view of a fluid takeoff device taken along the line A-A of F KG. 2;
  • FIG. 4 is a diagrammatic view showing the relation between the discharge rate and the circulation rate of the conventional takeofi connection in comparison with the fluid takeoff device according to the invention.
  • the reference numeral 1 designates a covering of the canned motor driven pump and 2 stands for a cylindrical inner sleeve of nonmagnetic responsive property in which a motor rotor chamber 3 is provided.
  • a shaft 4 is rotatably supported in spaced bearings 5a andSb between which a motor rotor 6 an outer surface of which being sealed with a sheet metal of nonmagnetic responsive property issecured to the shaft 4.
  • An impeller casing 7 is provided with an inlet 8 for flowing the fluid to the center axial direction, an impeller chamber and with a delivery outlet 10.
  • the shaft 4 is extended to the impeller chamber 9 and fitted with an impeller 11 so that a rotor axis and an impeller axis are of a coaxial relation.
  • the circular groove 15 is coated with a detachable screen member 116, material and mesh size of which may be determined in accordance with nature of the fluid being pumped and particle size of slurry included in said fluid.
  • the screen member according to the invention may have a greater area and also a superior self-washing ability as compared with the conventional cylindrical screen since it is always washed with the fluid flowing in parallel with the plane of the screen.
  • the spacing between the wall of the circular groove 35 and the screen 16 constitutes a fluid chamber 17 which is communicated with an inner slot llil provided in a common partition wall 14 partitioning the impeller chamber 9 and the motor chamber 13.
  • the inner slot 18 is connected to the circulation tubing 1% of the known structure at outside the common partition wail 14
  • the shaft 4 is rotated by the driving operation of the motor, the liquid being pumped by the impeller it is sucked through the inlet 8 and a majority of said liquid is fed to the outlet 10 under an increased velocity.
  • a part of sucked fluid is subjected to a boost pressure by means of the same impeller 11 to permeate into the space formed in the rear side of the impeller l1. between said impeller ii and the impeller chamber wall 12. While, a part of said liquid is iiitered off through the screen its to remove the slurries and then taken off into the fluid chamber l7.
  • the thusly filtered clean fluid is led through the inner slot l8 and the circulation tubing iii connected thereto at outside of partition wall into the motor rotor chamber to cool and lubricate the rotor and the bearing with the following circulation of the fluid through the clearance between the shaft and the outer sleeve to the impeller chamber.
  • the flow rate of the circulation fluid is satisfactorily stabilized without being influenced by the variation in the pump discharge rate as is shown by the solid line in FIG. 4.
  • a stable supply of the circulation fluid can be attained without suffering any influence of the variation in the pump discharge rate and the plugging by the slurries is perfectly prevented owing to the superior selfwashing capacity as the filter member is mounted in the same plane as the impeller chamber wall and therefore a performance of the canned motor driven pump is greatly increased.
  • takeoff means of fluid for cooling and lubricating motor rotors and bearings which comprises circular groove means provided with a predetermined width and depth in an impeller chamber surface of a partition wall partitioning impeller chamber and motor chamber and at a predetermined distance from the center of impeller chamber surface, filtering means mounted on the circular groove means for filtering off slurries, fluid chamber means formed between walls of the circular groove means and the filtering means, and slot means provided in the partition wall and connected at its one end to the circular groove means and at its the other end to the circulation connection for feeding a part of circulation fluid.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A fluid takeoff device for canned motor driven pump in which a part of the circulation fluid for cooling and lubricating motor rotors and bearings is led through the back wall of the pump impeller chamber so that a flow rate of the circulation fluid is always stabilized without being influenced by the variation in a discharge rate of the pump.

Description

United States Patent [72] Inventor RyuichiSato Tokyo, Japan [21] Appl. No. 764,242 [22] Filed Oct. 1,1968 [45] Patented Mar. 30, 1971 [73] Assignee Nikkiso Co., Ltd.
Tokyo, Japan [32] Priority Oct. 9, 1967 Japan [31] 42/6 4,837
[54] FLUID TAKEOFF DEVICE FOR CANNED MOTOR DRIVEN PUMP 2 Claims, 4 Drawing Figs.
[52] U.S. Cl 417/369, 310/63, 310/90, 418/102,415/1 12 [51] Int. Cl ..F04d 13/02, H02k 9/00, H02k 5/16 19 10 I f f -i',,-' & Z 16 1.
[50] Field ofSearch ..103/87(D), 87 (consulted), 87 (art), 87; 230/1 17, 209, 210; 310/54, 63, 90
[5 6] References Cited UNITED STATES PATENTS 2,925,041 2/1960 Sigmund 103/87 3,135,211 6/1964 Pezzillo 103/87 3,220,349 11/1965 White 103/87 Primary Examiner-Robert M. Walker Attorney-Blum, Moscovitz, Friedman and Kaplan ABSTRACT: A fluid takeoff device for canned motor driven pump in which a part of the circulation fluid for cooling and lubricating motor rotors and bearings is led through the back wall of the pump impeller chamber so that a flow rate of the circulation fluid is always stabilized without being influenced by the variation in a discharge rate of the pump.
Patented March 30, 1971 3,572,976
2 Sheets-Sheet 1 FIG-.1
INVENTOR ATTORNEY BACKGROUND OF THE INVENTION This invention relates to a fluid takeoff device for canned motor driven pump.
Generally, the canned motor driven pump has such characteristic features that an interior of the stator and an external surface of the rotor of the driving motor are welded and sealed with an anticorrosive sheet metal of nonmagnetic responsive property, and a part of the fluid is taken off from an outlet and then led through a circulation tubing into the rear side of the rotor chamber to permit a. further circulation of the fluid throughout passageways provided in the inner peripheries and the outer ends of the bearings, a spacing between the rotor and the stator, a passageway provided in an inner periphery and the outer ends of the front bearing, a clearance formed between shaft and a sleeve and an impeller balance hole so that the rotary parts of the rotor and'the impeller are all immersed in the liquid without remaining any movable portion passing through the liquid contacting portion and the outer portion, which enables to provide a perfect nonleakage pumping operation since there is no shaft sealing portion.
in the canned motor driven pump heretofore used, the circulation fluid for cooling and lubricating the motor and the bearing is taken ofi from the pump delivery connection through an auxiliary fluid takeoff pipe connected to the filter or screen provided along the tubular outlet.
According to this construction, however, a flow velocity at the nozzle portion is relatively changed with variation of the static pressure in proportion to the discharge rate of the pump so that flow rate of the circulation fluid is abruptly reduced in accordance with a rise of the discharge rate of the pump as is shown by a dotted line in HG. 4.
This defect makes it impossible to obtain an apparatus for removing an axial thrust of the motor rotor and, therefore, adversely affects to the duration of the thrust bearing in the fluid of the canned motor driven pump which does not always possess lubricity.
Further, when a flow rate of the circulation fluid is reduced less than a constant level, the motor is likely heated with a risk of heat deterioration.
SUMMARY OF THE lNVENTlON it is thus a principal object of the invention to eliminate the fatal defects in the conventional canned motor driven pump and to provide a new fluid takeoff device for canned motor driven pump which is simple in construction and operable with constant circulation fluid and without being influenced by the variation in the discharge rate of the pump.
Another object of the invention is to provide a new fluid takeoff device for canned motor driven pump in which a part of the circulation fluid for cooling and lubricating motor rotors and bearings is led through the back wall of the pump impeller chamber so that a flow rate of the circulation fluid is stabilized without being influenced by variation in the discharge rate of the pump.
Still another object of the invention is to provide a fluid takeoff device which comprises an impeller chamber surface of partition wall partitioning the impeller chamber and the motor chamber, a circular groove provided at a predetermined distance from the center of said impeller chamber surface with a given width and depth, a screen member covering said circular groove in such way that the surface of said screen member comes in flat with the plane of the impeller chamber surface, a fluid chamber formed of a spacing between the wall of circular groove and the screen member, an inner slot provided in the partition wall to communicate with the fluid chmber and a circulation tubing connected to said inner slot outside the partition wall.
These and other objects and advantages of this invention will become readily apparent and understood from the following nonlirnitative description and accompanying drawings in which the same reference numerals designate the same or similar parts throughout the drawings.
BRIEF DESCRIPTION OF THE DRAWKNGS:
FIG. 1 is a longitudinally sectioned lateral view, in partially broken away, of a canned motor driven pump with a fluid takeoff device applied in accordance with the invention;
FIG. 2 is a fragmentarily enlarged sectional view of the fluid takeoff device of !FIG. 1;
FIG. 3 is a fragmentarily enlarged sectional view of a fluid takeoff device taken along the line A-A of F KG. 2; and
FIG. 4 is a diagrammatic view showing the relation between the discharge rate and the circulation rate of the conventional takeofi connection in comparison with the fluid takeoff device according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, the reference numeral 1 designates a covering of the canned motor driven pump and 2 stands for a cylindrical inner sleeve of nonmagnetic responsive property in which a motor rotor chamber 3 is provided. A shaft 4 is rotatably supported in spaced bearings 5a andSb between which a motor rotor 6 an outer surface of which being sealed with a sheet metal of nonmagnetic responsive property issecured to the shaft 4.
An impeller casing 7 is provided with an inlet 8 for flowing the fluid to the center axial direction, an impeller chamber and with a delivery outlet 10.
The shaft 4 is extended to the impeller chamber 9 and fitted with an impeller 11 so that a rotor axis and an impeller axis are of a coaxial relation.
()n the impeller chamber surface 12 of a partition wall 14 partitioning the impeller chamber 9 and the motor chamber 13 is provided with a circular groove l5 having a predetermined width and depth at the predetermined distance from the center of said impeller chamber surface 12.
The circular groove 15 is coated with a detachable screen member 116, material and mesh size of which may be determined in accordance with nature of the fluid being pumped and particle size of slurry included in said fluid.
it is important that the screen member to should be fixed to the circular groove 15 so that the surface of the screen member l6 resides in the same plane as the impeller chamber wall 12.
By this construction, it has been appreciated that the screen member according to the invention may have a greater area and also a superior self-washing ability as compared with the conventional cylindrical screen since it is always washed with the fluid flowing in parallel with the plane of the screen.
The spacing between the wall of the circular groove 35 and the screen 16 constitutes a fluid chamber 17 which is communicated with an inner slot llil provided in a common partition wall 14 partitioning the impeller chamber 9 and the motor chamber 13.
The inner slot 18 is connected to the circulation tubing 1% of the known structure at outside the common partition wail 14 When the shaft 4 is rotated by the driving operation of the motor, the liquid being pumped by the impeller it is sucked through the inlet 8 and a majority of said liquid is fed to the outlet 10 under an increased velocity. A part of sucked fluid, however, is subjected to a boost pressure by means of the same impeller 11 to permeate into the space formed in the rear side of the impeller l1. between said impeller ii and the impeller chamber wall 12. While, a part of said liquid is iiitered off through the screen its to remove the slurries and then taken off into the fluid chamber l7.
The thusly filtered clean fluid is led through the inner slot l8 and the circulation tubing iii connected thereto at outside of partition wall into the motor rotor chamber to cool and lubricate the rotor and the bearing with the following circulation of the fluid through the clearance between the shaft and the outer sleeve to the impeller chamber. In this case, the flow rate of the circulation fluid is satisfactorily stabilized without being influenced by the variation in the pump discharge rate as is shown by the solid line in FIG. 4.
According to the invention, a stable supply of the circulation fluid can be attained without suffering any influence of the variation in the pump discharge rate and the plugging by the slurries is perfectly prevented owing to the superior selfwashing capacity as the filter member is mounted in the same plane as the impeller chamber wall and therefore a performance of the canned motor driven pump is greatly increased.
While certain preferred embodiments of the invention have been illustrated by way of example in the drawings and particularly described, it will be understood that various modifications may be made in the methods and constructions and that the invention is no way limited to the embodiments shown.
Iclaim:
1. In a canned motor driven pump, takeoff means of fluid for cooling and lubricating motor rotors and bearings, which comprises circular groove means provided with a predetermined width and depth in an impeller chamber surface of a partition wall partitioning impeller chamber and motor chamber and at a predetermined distance from the center of impeller chamber surface, filtering means mounted on the circular groove means for filtering off slurries, fluid chamber means formed between walls of the circular groove means and the filtering means, and slot means provided in the partition wall and connected at its one end to the circular groove means and at its the other end to the circulation connection for feeding a part of circulation fluid.
2. Takeoff means of fluid for cooling and lubricating motor rotors and bearings according to claim 1, wherein filtering means is fitted to circular groove means so that surface of said filtering means resides in the same plane as the impeller chamber surface.

Claims (2)

1. In a canned motor driven pump, takeoff means of fluid for cooling and lubricating motor rotors and bearings, which comprises circular groove means provided with a predetermined width and depth in an impeller chamber surface of a partition wall partitioning impeller chamber and motor chamber and at a predetermined distance from the center of impeller chamber surface, filtering means mounted on the circular groove means for filtering off slurries, fluid chamber means formed between walls of the circular groove means and the filtering means, and slot means provided in the partition wall and connected at its one end to the circular groove means and at its the other end to the circulation connection for feeding a part of circulation fluid.
2. Takeoff means of fluid for cooling and lubricating motor rotors and bearings according to claim 1, wherein filtering means is fitted to circular groove means so that surface of said filtering means resides in the same plane as the impeller chamber surface.
US764242A 1967-10-09 1968-10-01 Fluid takeoff device for canned motor driven pump Expired - Lifetime US3572976A (en)

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2411322A1 (en) * 1977-12-09 1979-07-06 Hermetic Pumpen Gmbh PROCEDURE FOR ACTING A CENTRIFUGAL PUMP AND PUMP SUITABLE TO BE ACTUATED FOLLOWING THIS PROCEDURE
US4198191A (en) * 1978-04-07 1980-04-15 General Electric Company Vaporization cooled dielectric fluid pump
US4349322A (en) * 1978-02-14 1982-09-14 Staehle Martin Cooling a motor of a centrifugal pump for conveying liquids with deposited solids
US4488852A (en) * 1976-11-26 1984-12-18 Engineers Sales-Service Co., Inc. Submersible pump apparatus
US4616980A (en) * 1983-12-06 1986-10-14 Crane Co. Canned motor pumps pressurized recirculation system
US4756665A (en) * 1986-02-03 1988-07-12 Mitsubishi Jukogyo Kabushiki Kaisha Centrifugal compressor
US4920863A (en) * 1986-09-24 1990-05-01 Mitsui & Co., Ltd. Plunger pump
US5131806A (en) * 1986-09-30 1992-07-21 Mitsui & Co., Ltd. Pump
EP0513222A1 (en) * 1990-02-06 1992-11-19 Ingersoll-Rand Company Centrifugal pump lubricant strainer system
US5277543A (en) * 1991-08-08 1994-01-11 Doryokuro Kakunenryo Kathatsu Jigyodan Device for monitoring abrasion loss of a thrust bearing in a submerged motor pump
US5397220A (en) * 1993-03-18 1995-03-14 Nippon Shokubai Co., Ltd. Canned motor pump
US6012909A (en) * 1997-09-24 2000-01-11 Ingersoll-Dresser Pump Co. Centrifugal pump with an axial-field integral motor cooled by working fluid
DE10216402A1 (en) * 2002-04-12 2003-10-23 Wilo Gmbh Centrifugal pump with integrated magnetic filter
US20030228232A1 (en) * 2002-06-05 2003-12-11 Cowans Kenneth W. Pump driven by motor with fluid filled rotor
US20050053494A1 (en) * 2003-09-04 2005-03-10 Lawrence Pumps, Inc. Open face cooling system for submersible motor
US20110229357A1 (en) * 2010-03-16 2011-09-22 Toyota Motor Engineering & Manufacturing North America, Inc. Pump assembly
US20130287875A1 (en) * 2010-12-07 2013-10-31 Naofumi Yoshimi Fluid feeder and tire curing device
US20150369258A1 (en) * 2013-01-25 2015-12-24 Daikin Industries, Ltd. Fluid device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2925041A (en) * 1955-01-28 1960-02-16 Sigmund Miroslav Pump and driving motor unit
US3135211A (en) * 1960-09-28 1964-06-02 Integral Motor Pump Corp Motor and pump assembly
US3220349A (en) * 1964-09-09 1965-11-30 Crane Co Motor driven pump

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2925041A (en) * 1955-01-28 1960-02-16 Sigmund Miroslav Pump and driving motor unit
US3135211A (en) * 1960-09-28 1964-06-02 Integral Motor Pump Corp Motor and pump assembly
US3220349A (en) * 1964-09-09 1965-11-30 Crane Co Motor driven pump

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4488852A (en) * 1976-11-26 1984-12-18 Engineers Sales-Service Co., Inc. Submersible pump apparatus
FR2411322A1 (en) * 1977-12-09 1979-07-06 Hermetic Pumpen Gmbh PROCEDURE FOR ACTING A CENTRIFUGAL PUMP AND PUMP SUITABLE TO BE ACTUATED FOLLOWING THIS PROCEDURE
US4349322A (en) * 1978-02-14 1982-09-14 Staehle Martin Cooling a motor of a centrifugal pump for conveying liquids with deposited solids
US4198191A (en) * 1978-04-07 1980-04-15 General Electric Company Vaporization cooled dielectric fluid pump
US4616980A (en) * 1983-12-06 1986-10-14 Crane Co. Canned motor pumps pressurized recirculation system
US4756665A (en) * 1986-02-03 1988-07-12 Mitsubishi Jukogyo Kabushiki Kaisha Centrifugal compressor
US4920863A (en) * 1986-09-24 1990-05-01 Mitsui & Co., Ltd. Plunger pump
US5131806A (en) * 1986-09-30 1992-07-21 Mitsui & Co., Ltd. Pump
EP0513222A1 (en) * 1990-02-06 1992-11-19 Ingersoll-Rand Company Centrifugal pump lubricant strainer system
EP0513222A4 (en) * 1990-02-06 1992-12-16 Ingersoll-Rand Company Centrifugal pump lubricant strainer system
US5277543A (en) * 1991-08-08 1994-01-11 Doryokuro Kakunenryo Kathatsu Jigyodan Device for monitoring abrasion loss of a thrust bearing in a submerged motor pump
US5397220A (en) * 1993-03-18 1995-03-14 Nippon Shokubai Co., Ltd. Canned motor pump
US6012909A (en) * 1997-09-24 2000-01-11 Ingersoll-Dresser Pump Co. Centrifugal pump with an axial-field integral motor cooled by working fluid
DE10216402A1 (en) * 2002-04-12 2003-10-23 Wilo Gmbh Centrifugal pump with integrated magnetic filter
US20030228232A1 (en) * 2002-06-05 2003-12-11 Cowans Kenneth W. Pump driven by motor with fluid filled rotor
WO2003104654A1 (en) * 2002-06-05 2003-12-18 Advanced Thermal Sciences Corp. Pump driven by motor with fluid filled rotor
US6769882B2 (en) * 2002-06-05 2004-08-03 Advanced Thermal Sciences Corp. Pressure compensation for localized bearing heating in pumps driven by motors with fluid filled rotors
US20050053494A1 (en) * 2003-09-04 2005-03-10 Lawrence Pumps, Inc. Open face cooling system for submersible motor
US7341436B2 (en) * 2003-09-04 2008-03-11 Lawrence Pumps, Inc. Open face cooling system for submersible motor
US20110229357A1 (en) * 2010-03-16 2011-09-22 Toyota Motor Engineering & Manufacturing North America, Inc. Pump assembly
US8496448B2 (en) * 2010-03-16 2013-07-30 Toyota Motor Engineering & Manufacturing North America, Inc. Pump assembly
US20130287875A1 (en) * 2010-12-07 2013-10-31 Naofumi Yoshimi Fluid feeder and tire curing device
US20150369258A1 (en) * 2013-01-25 2015-12-24 Daikin Industries, Ltd. Fluid device
US10233942B2 (en) * 2013-01-25 2019-03-19 Daikin Industries, Ltd. Fluid device

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